[jira] [Assigned] (FLINK-25513) CoFlatMapFunction requires both two flat_maps to yield something

["Dian Fu (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-25513?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dian Fu reassigned FLINK-25513:
-------------------------------

    Assignee: chendan

> CoFlatMapFunction requires both two flat_maps to yield something
> ----------------------------------------------------------------
>
>                 Key: FLINK-25513
>                 URL: https://issues.apache.org/jira/browse/FLINK-25513
>             Project: Flink
>          Issue Type: Bug
>          Components: API / Python
>    Affects Versions: 1.13.0
>            Reporter: chendan
>            Assignee: chendan
>            Priority: Major
>              Labels: pull-request-available
>
> When I used CoFlatMapFunction in pyflink, I found out that I must put yield something in both flat_map1 and flat_map2. Otherwise, it will raise an exception: TypeError: 'NoneType' object is not iterable.
> In pyflink source code: datastream.py,  the process_element2 of KeyedCoMapCoProcessFunction class in ConnectedStreams class has only one sentence: 
> {color:#cc7832}yield {color}{color:#94558d}self{color}._underlying.map2(value). if the flat_map2 has not yield something it will result in exception. So it should judge whether the {color:#94558d}self{color}._underlying.map2(value) is None or not firstly.



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